Private classes are
only available in their declaring file. The following class A is public while class B is private.
class A
{
//...
}
private class B
{
//...
}
A class name is a sequence of one or more alphanumeric characters, including the underscore character,
starting with an uppercase letter; this convention is enforced by the compiler that will throw a
compilation error otherwise. The class name is optionally followed by the keyword extends and by the
class name of a parent class. Finally the class declaration can include one or more implements
declarations. For each implements a single class name or interface name must be specified.
Features in classes are exposed as fields (also referred as members) of two kinds:
Variables: placeholders for value containers, references for objects, or function definitions. Variables
can be enhanced with access and value modifiers.
Functions: actions that the object or the class can perform.
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Chapter 5: Delving Into Object-Oriented Programming
Variables and functions can be declared as static fields or as an instance.
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